Doorbell



July 5, 1938. c. A. ROBERTSON DOORBELL Filed Feb. 2,1938 2 Sheets-Sheet 2 A iio'rneys Patented July 5, 1938 PATENT OFFICE DOORBELL Cleo Alverdo Robertson,

of one-half to Kans.

Oxford, Kans., assignor Truman. H. Morgan, Winfield,.

I Application February 2, 1938, Serial No. 188,361

1 Claim.

The present inventionrelates'to new and useful improvements in door bells and has for its primary object to provide, in a manner as hereinafter set forth, a device of this character which 5 is mounted in the door knobs for convenient operation by a caller.

Another very important object of the invention is to provide a door bell of the aforementioned character comprising a plurality of clappers or 10 hammers, together with novel means for actuating said clappers or hammers.

Other objects of the invention are to provide a door bell of the character described which will be comparatively simple in construction, strong, durable, highly efficient and reliable in use, compact and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a view in vertical longitudinal section through an embodiment of the invention.

Figure 2 is a cross sectional view, taken substantially on the line 2--2 of Fig. 1.

Figure 3 is a detail view in elevation of one of the knob securing clips.

Figure 4 is a view in vertical longitudinal section through a modification.

Referring now to the drawings in detail, it will be seen that the reference numeral designates a tubular spindle of suitable length. Threadedly mounted on the end portions of the spindle I are inner and outer knobs which are designated generally by the reference numerals 2 and 3, respectively. The outer knob 3 comprises a substantially dome shaped member 4 40 having extending thereinto a cylinder .5 which is open at its outer end and closed at its inner end. The knob 3 further includes a plate or the like 6 on which the member 4 is mounted and which, in turn, is fixed on a sleeve 1 which is 45 threaded on the spindle I.

Threadedly mounted on the inner end portion of the spindle is a socket member 8. Fixed on the socket member 8 and projecting longitudinally therefrom is a tube or cylinder 9 having slots I therein. Fixed in the outer end portion of the tube or cylinder 9 is an internally threaded socket member or cup I I. The reference numeral l2 designates a bell provided with a shoulder or stepped centrally located boss or projection I3 which is threadedly engaged in the cup The inner knob 2' comprises a substantially dome shaped member M which is clamped between the cup H and the shoulder l5 of the boss l3. A screw l6 prevents unscrewing of the bell l2. The knob 2 further includes a plate or the like I! 5 which is fixed on the socket member 8 and to which the periphery of the member I4 is fixed.

The reference numeral l8 designates a ring which encircles the tube or cylinder 9 and which is mounted thereon, as at I9, for rocking move- 10 ment. Extending from the ring I8 are angular dogs 20 the free end portions of which extend into the tube or cylinder 9 through the slots l0. Mounted at intermediate points on the dogs 20 are clappers 2|. The clappers 2| are operable in openings 22 which are provided therefor in the member I4 of the knob 2 for engagement with the bell l2.

Extending slidably through the tubular spindle is a rod or the like 23. One end portion of the rod 23 extends slida'bly into the cylinder 5 and has mounted thereon an operating button or head 24. A coil spring encircles the rod 23 in the cylinder 5 and is engaged with the button or head 24 for returning same to its normal posi- 25 tion. The button or head 24 is retained in the cylinder 5 by a snap ring 26 which is mounted in a groove provided therefor in the outer end portion of said cylinder 5.

Mounted on the other end portion of the rod 23 for longitudinal movement in the tube or cylinder 9 is a multiple cam 21. A coil spring 28 is mounted in the tube or cylinder 9 and engaged with the multiple cam 21 for returning same to its normal or retracted position. The knobs 2 and 3 are secured against rotation on the threaded end portions of the spindle I by resilient clips 29. The clips 29 comprise pins 30 which are engageable in sockets 3| which are provided therefor in the end portions of the spindle I.

It is thought that the operation of the invention will be readily apparent from a consideration of the foregoing. When it is desired to ring the bell, the button 24 is pressed inwardly against the tension of the comparatively light coil spring 25, thus actuating the multiple cam 21 in the cylinder 9 against the tension of the coil spring 28 through the medium of the rod 23. The free ends of the angular dogs 20 ride on the cam 21 and thus, when said cam moves longitudinally in the cylso inder 9, the ring I8 is caused to rock or oscillate in a manner to cause the clappers 2| to alternately strike the bell l2. As shown to advantage in Fig. 1 of the drawings, the construction of the dogs 20 is such as to cause a rocking movement of the ring I8. In other words, one of the dogs 20 is engaged in one of the low points in the multiple cam 21 whilethe other of said dogs is engaged with one of the high points thereof. When the button 24 is released the springs 25 and 28 return the elements to normal position and further ringing of the bell is had.

In Figure 4 of the drawings, the reference numeral 32 designates a comparatively long sleeve which is threadedly mounted on the outer end portion of the spindle I and which is provided, on its outer end, with a cylinder 33. Fixed on the sleeve 32 and substantially enclosing the cylinder 33 is a comparatively small knob member 34. In this form of the invention it will be observed that the rod 23 extends directly into the cylinder 33 from the spindle I.

It is believed that the many advantages of a door bell constructed in accordance with the present invention will be readily understood and although preferred embodiments of the device are as illustrated and described, it is to be understood that further modifications and changes in the details of construction may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is:-

A device of the class described comprising a spindle, cylinders mounted on the end portions of said spindle, a rod slidably mounted in the spindle and extending into the cylinders, an operating button on one end of the rod in one of the cylinders, a cam on the other end of the rod and operable in the other cylinder, a bell mounted on said other cylinder, 2, ring encircling said other cylinder and rockably mounted thereon, clappers mounted on said ring and engageable with the bell, and dogs on said ring engaged with the cam for actuation thereby for alternately engaging the clappers with the bell.

CLEO ALVERDO ROBERTSON. 

